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The continuously pumping myocardium requires oxygen and nutrients for normal function, supplied by blood from the coronary arteries. Occlusion of the coronary arteries can result in ischemic death of cardiomyocytes, leading to myocardial infarction. The intrinsic neovascular response of the heart to ischemic injury is typically insufficient to fully reestablish perfusion within the infarcted myocardium, which is subsequently replaced by nonfunctional scar tissue. The coronary arteries originate from the aortic sinuses of the ascending aorta, just superior to the aortic valve at the sinotubular junction. Two main coronary arteries are present—the right and the left—both arising perpendicularly from the aorta. The right coronary artery (RCA) arises from the right anterior aortic sinus. The left coronary artery (LCA), also referred to as the "left main coronary artery" (LMCA), arises from the left anterior aortic sinus. The LMCA bifurcates into the left anterior descending (LAD) artery, which courses over the interventricular septum within the anterior interventricular sulcus toward the cardiac apex and supplies the anteroseptal wall of the heart, and the left circumflex (LCx) coronary artery, which courses within the left atrioventricular groove and supplies the posterior and lateral portions (see Image. Gross Anatomy and Coronary Vasculature of the Heart).[1] The LAD, also known as the anterior interventricular branch of the LCA, serves as the principal arterial supply to the anterior left ventricular wall and the majority of the interventricular septum. Owing to its extensive perfusion territory, occlusion of the LAD frequently results in a large myocardial infarction with marked impairment of left ventricular function and an adverse prognosis, leading to the clinical designation “widow-maker.” The LAD is a common target for both diagnostic imaging and coronary revascularization.[2][3] Recognition of anatomical variants, including a “wrap-around” LAD and dual LAD anatomy, has become increasingly important for contemporary imaging, interventional planning, and surgical strategy. A comprehensive understanding of LAD anatomy, function, embryology, physiologic variants, procedural considerations, and clinical significance remains essential for practitioners involved in cardiac imaging, intervention, and education in coronary anatomy.